CN107203478B - Data storage method and device - Google Patents

Abstract

The invention discloses a data storage method and a data storage device, wherein when data to be stored needs to be expanded, modification information of preset data item description information is acquired, wherein the preset data item description information is data item attribute group information comprising data offset information, data length information, last field information and subsequent item information; modifying the description information of the preset data item according to the modification information to obtain the description information of the extended data item; and storing the expanded data to be stored to a storage medium according to the expanded data item description information. Each item of data is described through the data item description information attribute group, and when the data length needs to be expanded, only the last field information and the subsequent item information of the original data item need to be simply modified, so that the influence of the expansion of the data item on other data items is avoided; meanwhile, the storage space is not required to be reserved for each data item, the difficulty of data layout design in a storage medium at the initial stage of system design is reduced, and the extensibility of stored data is improved.

Description

A method and device for data storage

technical field

The present invention relates to the technical field of storage, and in particular, to a method and device for data storage.

Background technique

With the development of storage technology, the length of data that needs to be stored is also increasing.

In the prior art, data is stored in a storage medium in a sequential preservation manner, and the storage medium may be a storage device such as an EEPROM. When data needs to be stored in a storage medium such as an EEPROM, generally, the data is stored sequentially in the form of (data offset, data length) pairs.

However, when the data length of the data to be stored changes, for example, it is assumed that the product_sn occupies 7 bytes in the early stage of the system design, and the 0x0000-0x0006 seven bytes of the EEPROM are used to store the product_sn during implementation, and one The bytes are used for expansion; and the four bytes starting at offset 0x0008 are used to store the ipv4 address of the node. During the development process, it was found that the product serial number product_sn needs to be expanded from 7 bits to 9 bits, and the data in the EEPROM is organized according to the traditional form. Due to insufficient reserved space, firstly, the ipv4 address data needs to be moved backward to leave enough space for product_sn. When the storage location of the ipv4 address data is changed, the description information of the ipv4 data (data offset, data length) data pair must be modified at the same time; when a large amount of data is stored in the EEPROM, the storage space adjustment caused by the format change will change. It is extremely complex, and the complexity is not inferior to the reallocation of EEPROM space. It can be seen from the above that there are major drawbacks in the method of sequential storage: when the format of a certain piece of information changes, such as when the length becomes longer and the reserved space is not enough to accommodate the new data format, it is necessary to re-plan all data in the EEPROM The distribution of information will cause waste of preliminary work; and reserving more than required storage space for each piece of information will inevitably lead to waste of space.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a data storage method and device, and the purpose is to solve the problem of poor scalability of data stored in the existing sequential storage method.

In order to solve the above-mentioned technical problems, the present invention provides a method for data storage, the method comprising:

When the data to be stored needs to be expanded, the modification information of the description information of the preset data item is obtained, wherein the description information of the preset data item is a data item including data offset information, data length information, last field information and subsequent item information attribute group information;

According to the modification information, modify the preset data item description information to obtain extended data item description information, where the modification information is information used to modify the subsequent item information and the last field information;

According to the description information of the extended data item, the extended data to be stored is stored in a storage medium.

Optionally, after storing the to-be-stored data to a storage medium according to the extended data item description information, the method further includes:

Get the data read command;

Read extended data and original stored data according to the subsequent item information and the last field information contained in the data read instruction;

The control data and the original stored data are spliced to obtain the expanded data to be stored.

Optionally, the storage medium is an EEPROM.

In addition, the present invention also provides a data storage device, the device comprising:

A modification information acquisition module, configured to acquire modification information of the description information of a preset data item when the data to be stored needs to be expanded, wherein the description information of the preset data item includes data offset information, data length information, and last field information and data item attribute group information of subsequent item information;

A description information modification module, configured to modify the preset data item description information according to the modification information to obtain extended data item description information, where the modification information is used to modify the subsequent item information and the last field information Information;

An extended storage module, configured to store the extended data to be stored in a storage medium according to the extended data item description information.

Optionally, also include:

The read instruction acquisition module is used to acquire the data read instruction;

a reading module, configured to read extended data and original storage data according to the subsequent item information and the last field information contained in the data reading instruction;

The splicing module is used for splicing the control data and the original stored data to obtain the expanded data to be stored.

Optionally, the storage medium is an EEPROM.

In the method and device for data storage provided by the present invention, when the data to be stored needs to be expanded, the modification information of the description information of a preset data item is obtained, wherein the description information of the preset data item includes data offset information, data The data item attribute group information of length information, last field information and subsequent item information; according to the modification information, modify the preset data item description information to obtain the extended data item description information, and the above modification information is used to modify the last field information and subsequent items. information; store the expanded data to be stored in the storage medium according to the expanded data item description information. This application describes each item of data through the data item description information attribute group. When the data length needs to be extended, it is only necessary to simply modify the last field information and subsequent item information of the original data item, thereby avoiding the expansion of the data item to other data items. At the same time, there is no need to consider reserving storage space for each data item, which reduces the difficulty of data layout design in the storage medium in the early stage of system design, thereby improving the scalability of stored data.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention or the prior art more clearly, the following will briefly introduce the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only For some embodiments of the present invention, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic flowchart of a specific implementation of a data storage method provided by an embodiment of the present invention;

FIG. 2 is a structural block diagram of a data storage device provided by an embodiment of the present invention.

Detailed ways

In order to make those skilled in the art better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to FIG. 1. FIG. 1 is a schematic flowchart of a specific implementation of a data storage method provided by an embodiment of the present invention. The method includes the following steps:

Step 101: When the data to be stored needs to be expanded, obtain the modification information of the description information of the preset data item, wherein the description information of the preset data item includes data offset information, data length information, last field information and subsequent item information The data item attribute group information.

It can be understood that the above-mentioned last field information may refer to the information representing whether each row of data to be stored is the last field, that is, whether each data is the last data, specifically, it can be represented by is_end, when is_end is listed as false, it indicates that the row The data is not the last data; when the is_end column is true, it indicates that the row of data is the last data.

The above subsequent item information can indicate the information of a subsequent row of data items, which can be specifically represented by next_field. When the is_end column is false, the next_field column indicates the row of the subsequent data.

Step 102: Modify the preset data item description information according to the modification information to obtain extended data item description information, where the modification information is information for modifying the subsequent item information and the last field information.

The above modification information may refer to the information configured by the user for the above-mentioned subsequent line information and last field information as required, for example, the is_end column may be changed from true to false.

Step 103: Store the expanded data to be stored in a storage medium according to the expanded data item description information.

It can be understood that the above-mentioned storage medium is preferably an EEPROM, of course, it can also be other storage medium, which is not limited here.

In order to better introduce the whole process of extended storage, the following will take the example of storing product_sn (the serial number of the product) to the EEPROM for description.

Assuming that product_sn occupies 7 bytes in the early stage of system design, seven bytes of 0x0000-0x0006 of EEPROM are used to store product_sn during implementation, and one byte is reserved for expansion; and four bytes starting from offset 0x0008 The bytes are used to store the ipv4 address of the node.

During the development process, it was found that product_sn needs to be expanded from 7 bits to 9 bits. The eeprom_dafa_field attribute array as shown below is used to describe the information of each data item, and each line is used to describe the storage method of an item in the data_filed_enum in the EEPROM. Each row before the last_field_e item in the array represents the basic row; each row after the last_field_e item represents an extended row, which is an extension of the data in the basic row; each column represents an attribute of the data, and the is_end column represents whether the row of data is the last data , when the is_end column is false, the next_field column indicates the row of the subsequent data.

When the product_sn_e in the EEPROM needs to be extended from 7 bytes to 9 bytes, it is only necessary to change the is_end item of the line corresponding to product_sn_e from true to false, indicating that the data in this line is not the final data; look for a block of 2 bytes in the EEPROM The free space for storing the extended part of product_sn_e; add a row (last_field_e+1) to the eeprom_dafa_field to describe the extended EEPROM storage space; modify the next_field column of the row corresponding to product_sn_e to a new row in the extended EEPROM storage space.

After the data in the EEPROM is extended and stored, when reading product_sn_e, it can be judged that the row of data is incomplete by is_end being false, and then the extended data can be found according to the next_filed column, and the two are spliced into a complete product_sn.

As a specific implementation manner, after storing the data to be stored in the storage medium according to the extended data item description information, the method may further include: acquiring a data read instruction; according to the data read instruction included in the data read instruction The subsequent item information and the last field information, read the extended data and the original stored data; splicing the control data and the original stored data to obtain the expanded data to be stored.

In the data storage method provided in this embodiment, when the data to be stored needs to be expanded, the modification information of the description information of the preset data item is obtained, wherein the description information of the preset data item includes data offset information, data length information, The data item attribute group information of the last field information and the subsequent item information; according to the modification information, modify the preset data item description information to obtain the extended data item description information, and the above modification information is the information used to modify the last field information and the subsequent item information. ; According to the description information of the extended data item, store the extended data to be stored in the storage medium. The method describes each item of data through the data item description information attribute group. When the data length needs to be extended, only the last field information and subsequent item information of the original data item need to be simply modified, avoiding the expansion of the data item to other data items. At the same time, there is no need to consider reserving storage space for each data item, which reduces the difficulty of data layout design in the storage medium in the early stage of system design, thereby improving the scalability of stored data.

The following describes the data storage device provided by the embodiment of the present invention, and the data storage device described below and the data storage method described above may refer to each other correspondingly.

FIG. 2 is a structural block diagram of a data storage device provided by an embodiment of the present invention. Referring to FIG. 2, the data storage device may include:

The modification information acquisition module 21 is configured to acquire modification information of the description information of a preset data item when the data to be stored needs to be expanded, wherein the description information of the preset data item includes data offset information, data length information, and last field Data item attribute group information of information and subsequent item information;

The description information modification module 22 is configured to modify the description information of the preset data item according to the modification information to obtain the description information of the extended data item, and the modification information is used for modifying the subsequent item information and the last field information about the information;

The extended storage module 23 is configured to store the extended data to be stored in a storage medium according to the extended data item description information.

Optionally, also include:

The read instruction acquisition module is used to acquire the data read instruction;

a reading module, configured to read extended data and original storage data according to the subsequent item information and the last field information contained in the data reading instruction;

The splicing module is used for splicing the control data and the original stored data to obtain the expanded data to be stored.

Optionally, the storage medium is an EEPROM.

The data storage device provided in this embodiment describes each item of data through the attribute group of data item description information. When the data length needs to be extended, it is only necessary to simply modify the last field information and subsequent item information of the original data item to avoid At the same time, there is no need to consider reserving storage space for each data item, which reduces the difficulty of data layout design in the storage medium in the early stage of system design, thereby improving the scalability of stored data. .

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments may be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the description of the method.

The data storage method and device provided by the present invention have been described in detail above. The principles and implementations of the present invention are described herein by using specific examples, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (4)

1. A method of data storage, comprising:

when the data to be stored needs to be expanded, acquiring modification information of preset data item description information, wherein the preset data item description information is data item attribute group information comprising data offset information, data length information, last field information and subsequent item information;

modifying the preset data item description information according to the modification information to obtain extended data item description information, wherein the modification information is used for modifying the subsequent item information and the last field information;

storing the expanded data to be stored into a storage medium according to the expanded data item description information;

after the storing the data to be stored to a storage medium according to the extended data item description information, the method further includes: acquiring a data reading instruction; reading extended data and original storage data according to the subsequent item information and the last field information contained in the data reading instruction; and splicing the control data and the original storage data to obtain the expanded data to be stored.

2. The method of claim 1, wherein the storage medium is an EEPROM.

3. An apparatus for data storage, comprising:

the system comprises a modification information acquisition module, a data storage module and a data processing module, wherein the modification information acquisition module is used for acquiring modification information of preset data item description information when data to be stored needs to be expanded, and the preset data item description information is data item attribute group information comprising data offset information, data length information, last field information and subsequent item information;

a description information modification module, configured to modify the preset data item description information according to the modification information to obtain extended data item description information, where the modification information is information used to modify the subsequent item information and the last field information;

the extended storage module is used for storing the extended data to be stored to a storage medium according to the extended data item description information;

the device, still include: the reading instruction acquisition module is used for acquiring a data reading instruction; the reading module is used for reading the extended data and the original storage data according to the subsequent item information and the last field information contained in the data reading instruction; and the splicing module is used for splicing the control data and the original storage data to obtain the expanded data to be stored.

4. The apparatus of claim 3, wherein the storage medium is an EEPROM.

Images